Verbs with the following endings conjugate differently.
Verbs with -oyer/uyer change "y" to "i" before silent "e" (ennuyer – ennuie).
Verbs with -eyer do not change this way.
Verbs with -ayer change ...

My question is about the history of the conjuagation of french verbs. How did french verbs get the endings they have today in different tenses? There are some interesting facts in this field I managed ...

Here's a bit of funniness I discovered the other day.
The verb suivre has a first-person singular conjugation of je suis, which is exactly the same as "I am".
So the sentence I follow Jesus becomes ...

Some verbs, in their first person singular form, have an unpronounced '-s' at the end. For example, je suis, je finis, etc.
In Latin, the suffix for first person singular was '-o' or '-m': thus sum ...